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We don't stop hiking because we grow old, we grow old because we stop hiking. -- Finis Mitchell

Glacier National Park turns 100

Today is the 100th birthday of Glacier National Park in Montana.

100 years is awesome. But will the park make it another 10? That's what an article in USA Today looked at.The gorgeous million-acre park in northwestern Montana celebrated its 100th birthday on Tuesday. But many of its glaciers have melted, and scientists predict the rest may not last another decade.

The forests are drier and disease-ridden, leading to bigger wildfires. Climate change is forcing animals that feed off plants to adapt.

Many experts consider Glacier Park a harbinger of Earth's future, a laboratory where changes in the environment will likely show up first.

Average temperatures have risen in the park 1.8 times faster than the global average, said Dan Fagre, a U.S. Geological Survey scientist.

The change is visible to the naked eye, with the vast moraines left behind as the giant glaciers melt away. Climate change is blamed for the increasing size and frequency of wildfires, and lower stream flows as summer progresses.